1 Answer
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Unfortunately, I do not see iwlwifi in any version of Ubuntu that I'm using (maybe you could clarify which brand of Ubuntu you are using, which package versions you have installed, where did you get them from), therefore my answer will be generic.

In general, you can force the installation of a particular version like that:

sudo apt-get install package=version

You can find what versions are available by

apt-cache policy package

Also, you can locate the particular deb package you need, download it and downgrade it manually:

sudo dpkg -i --force-downgrade packagename.deb

You can then make sure that the package will not be upgraded by pinning it, either in the GUI of the synaptic package manager, or through command line:

sudo echo package hold | dpkg --set-selections

Unfortunately, if the package is not available in a particular version, you need to install it from sources, following the instructions on the website of the package originator.